Elucidation of the active surface and origin of the weak metal–hydrogen bond on Ni/Pt(111) bimetallic surfaces: a surface science and density functional theory study

Kitchin, John R.; Khan, Neetha A.; Barteau, Mark A.; Chen, Jingguang G.; Yakshinskiy, B. V.; Madey, Theodore E.

doi:10.1016/j.susc.2003.09.007

Cited by 160 publications

(176 citation statements)

References 32 publications

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“…However, a network of white lines can be observed on the terraces, which is characteristic for the Pt-skin structure containing TMs in the subsurface regions. 32,60,62,63 The above results confirm that UHV annealing of the Ni/Pt(111) surface at an appropriate temperature, e.g. 800 K, can induce inward diffusion of the surface Ni into the subsurface region, producing the Pt-skin surface, Pt/Ni/Pt(111).…”

Section: ' Introductionsupporting

confidence: 67%

“…77 On the other hand, inward diffusion of surface 3d-TMs into the subsurface or even bulk regions of Pt crystals may happen upon heating in UHV or reductive atmospheres ( Figure S2). 10,56,60,62,78,79 Accordingly, the surface structure of the PtNi/CB catalysts can be simply controlled by reduction in H 2 . For this purpose, our PtNi/CB catalysts were reduced in H 2 for 2 h at 423, 523, and 623 K, respectively.…”

Section: ' Introductionmentioning

confidence: 99%

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Synergetic Effect of Surface and Subsurface Ni Species at Pt−Ni Bimetallic Catalysts for CO Oxidation

et al. 2011

J. Am. Chem. Soc.

269

193

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Various well-defined Ni-Pt(111) model catalysts are constructed at atomiclevel precision under ultra-high-vacuum conditions and characterized by X-ray photoelectron spectroscopy and scanning tunneling microscopy. Subsequent studies of CO oxidation over the surfaces show that a sandwich surface (NiO 1-x /Pt/Ni/Pt(111)) consisting of both surface Ni oxide nanoislands and subsurface Ni atoms at a Pt(111) surface presents the highest reactivity. A similar sandwich structure has been obtained in supported Pt-Ni nanoparticles via activation in H 2 at an intermediate temperature and established by techniques including acid leaching, inductively coupled plasma, and X-ray adsorption nearedge structure. Among the supported Pt-Ni catalysts studied, the sandwich bimetallic catalysts demonstrate the highest activity to CO oxidation, where 100% CO conversion occurs near room temperature. Both surface science studies of model catalysts and catalytic reaction experiments on supported catalysts illustrate the synergetic effect of the surface and subsurface Ni species on the CO oxidation, in which the surface Ni oxide nanoislands activate O 2 , producing atomic O species, while the subsurface Ni atoms further enhance the elementary reaction of CO oxidation with O.

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Section: ' Introductionsupporting

confidence: 67%

Section: ' Introductionmentioning

confidence: 99%

Synergetic Effect of Surface and Subsurface Ni Species at Pt−Ni Bimetallic Catalysts for CO Oxidation

et al. 2011

J. Am. Chem. Soc.

269

193

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“…These structures include a variety of forms of strain, including isotropic and anisotropic strain, pseudomorphic monolayers of Ni, Pd, and Pt on Nb, Ta, Mo, W, Re, Ru, Ir, Os, Ni and Pt, surface and subsurface alloys (from Ref. [11]), bimetallic sandwich structures (from Ref. [6]), and a variety of coordination environments (sheets, slabs, and solids).…”

Section: Volume 93 Number 15 P H Y S I C a L R E V I E W L E T T E Rmentioning

confidence: 99%

“…However, the cutoff radius is arbitrary, so we have not presented these results. [11]. Details for the Pt-3d surfaces can be found in Ref.…”

Section: Volume 93 Number 15 P H Y S I C a L R E V I E W L E T T E Rmentioning

confidence: 99%

Role of Strain and Ligand Effects in the Modification of the Electronic and Chemical Properties of Bimetallic Surfaces

et al. 2004

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“…9 Kitchin et al recently reported experimental investigations of the effects of subsurface Ni on the chemical properties of Pt͑111͒ single crystals. 10 In that study, thin films of Ni on Pt͑111͒ were prepared by physical vapor deposition of Ni onto the surface, followed by subsequent annealing to drive the Ni atoms into subsurface positions. This particular structure was found to have a weaker hydrogen adsorption energy than either pure Ni͑111͒ or Pt͑111͒ surfaces.…”

Section: Introductionmentioning

confidence: 99%

Modification of the surface electronic and chemical properties of Pt(111) by subsurface 3d transition metals

Kitchin¹,

Nørskov²,

Barteau³

et al. 2004

The Journal of Chemical Physics

1,263

1,016

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The modification of the electronic and chemical properties of Pt͑111͒ surfaces by subsurface 3d transition metals was studied using density-functional theory. In each case investigated, the Pt surface d-band was broadened and lowered in energy by interactions with the subsurface 3d metals, resulting in weaker dissociative adsorption energies of hydrogen and oxygen on these surfaces. The magnitude of the decrease in adsorption energy was largest for the early 3d transition metals and smallest for the late 3d transition metals. In some cases, dissociative adsorption was calculated to be endothermic. The surfaces investigated in this study had no lateral strain in them, demonstrating that strain is not a necessary factor in the modification of bimetallic surface properties. The implications of these findings are discussed in the context of catalyst design, particularly for fuel cell electrocatalysts.

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Elucidation of the active surface and origin of the weak metal–hydrogen bond on Ni/Pt(111) bimetallic surfaces: a surface science and density functional theory study

Cited by 160 publications

References 32 publications

Synergetic Effect of Surface and Subsurface Ni Species at Pt−Ni Bimetallic Catalysts for CO Oxidation

Synergetic Effect of Surface and Subsurface Ni Species at Pt−Ni Bimetallic Catalysts for CO Oxidation

Role of Strain and Ligand Effects in the Modification of the Electronic and Chemical Properties of Bimetallic Surfaces

Modification of the surface electronic and chemical properties of Pt(111) by subsurface 3d transition metals

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